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Square D QOB390 - 3-Pole Circuit Breaker 90A, 10kA AIC

Square D
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Square D QOB390 is a three-pole molded case circuit breaker designed to provide reliable overcurrent protection for three-phase electrical systems. It features a 90A current rating and a 120/240VAC voltage rating, with a compact bolt-on design measuring 89 mm x 57 mm x 74 mm (H x W x D) and a weight of 1.1 lb. The breaker utilizes a thermal-magnetic trip mechanism for both long-time and instantaneous protection, is CSA and UL listed, and is rated for 10kA interrupting capacity at 240V. It is engineered for installation in Square D NQOD panelboards, operating effectively in ambient temperatures from -25°C to 70°C and accommodating copper or aluminum conductors from AWG 4 to 2/0 via its pressure plate terminals.

Key Features & Specifications
  • Type: Three-pole, molded case, thermal-magnetic circuit breaker with bolt-on connection
  • Voltage Rating: 120/240VAC
  • Current Rating: 90A
  • Frame Size: 100A/QO
  • AIC Rating: 10kA @ 240V
  • Poles: 3
  • Phase: 3
  • Connection: Bolt-On
  • Terminal Connection: Pressure Plate
  • Wire Size: AWG 4 to AWG 2/0 (Copper or Aluminum)
  • Protection: Thermal Magnetic
  • Functions: Long Time and Instantaneous Trip
  • Standards: CSA, UL Listed
  • Panel Type: Square D NQOD Panelboards
  • Dimensions: 3.5 in (89 mm) H x 2.2 in (57 mm) W x 2.9 in (74 mm) D
  • Weight: 1.1 lb
  • Temp Rating: -25°C to 70°C (-13°F to 158°F)
  • Breaker Type: Standard
  • MCM Size: Min. Wire Size 8 AWG, Max. Wire Size 2 AWG


Product Identification
  • UPC: 785901019725
  • GTIN: 00785901019725